3.2.1 periodicity

Question 1

how does the atomic radii change across period 3

Answer 1

gets smaller as there is an increased number of protons and no increase in the amount of shielding so the attraction between the nucleus and the outer shell is bigger so the atoms get smaller

Question 2

what is electronegativity

Answer 2

the relative tendency of an atom to attract a shared pair of electrons in a covalent bond

Question 3

what is the trend in electronegativity across period 3

Answer 3

electronegativity increases as there are more protons in the nucleus and the same amount of shielding so the atom is more likely to attract a shared electron pair

Question 4

how do melting points change as you go across period 3

Answer 4

increase from Na to Al dur to increased metallic bonding
Si has the highest mpt as it is macromolecular and needs more energy to break the covalent bonds
P to Ar are all low as they only have VDW forces